I'm in the beginning of building a house and also my tank. It will be a 12'x4'x4' peninsula fish only. I had built a house a few years back and put another large tank in it as well but sold the house before I could get the tank going. The new owners are dealing with evaporation and some moisture problems now. I want to know what others have done in dealing with these issues that have larger tanks. Thanks for any help.